An average home in the United States consumed about 12,773 kWh of electricity in 2005. The national average carbon dioxide emission rate for electricity generated in 2007 was 1,293 lbs. of CO2 per megawatt-hour. Approximately 7% of the electricity generated is wasted due to losses in the transmission and distribution system.
a. How much CO2 was generated per year for an average U.S. home due to electricity use?
b. How much CO2 was emitted from household use of electricity is there were 111.1 million homes in the United States in 2005?
c. How much CO2 will be emitted from household use of electricity if there are 166 million homes in the United States in 2050?
What will be an ideal response?
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Answer the following statement(s) true (T) or false (F)
1. The vane-operated limit switch has the advantage of excellent response time, but at the cost of low accuracy. 2. A SLO-SYN stepping motor can operate from a single-phase power source. 3. In an open-loop system, there is no feedback provided to the control system to monitor the device and to compensate for any error in the system. 4. Only minimal sensor tasks are required when automating technical processes. 5. In fast-acting systems, the integral term tends to make the system more stable.
A single person can effectively handle a dairy herd of about _____ cows
a. 100 c. 200 b. 150 d. 250
When Franklin Roosevelt assumed the presidency in March 1933
A. Congress refused to grant him any legislative authority. B. he knew exactly what he wanted to do. C. he received unprecedented congressional support. D. he rejected a pragmatic approach to governing the country. E. he at first proceeded cautiously.
Calculate the voltage drop of a 120/240-volt, three-wire underground residential service installed with 2 AWG aluminum URD cable if the load is 80 amperes and the one-way length of the underground service conductors is 100 feet.
What will be an ideal response?